Apple AppleCare Protection Plan for iPhone - Manual (Page 15)

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(ii) Direct mail-in service. If Apple determines that your Covered
Equipment is eligible for mail-in service, Apple will send you
prepaid way bills (and if you no longer have the original
packaging, Apple may send you packaging material) and you
will ship the Covered Equipment to Apple’s repair service
location in accordance with its instructions. Once service is
complete, the Apple repair service location will return the
Covered Equipment to you. Apple will pay for shipping to
and from your location if all instructions are followed.
(iii) Do-It-Yourself Parts service is available for many Covered
Equipment parts or accessories, allowing you to service your
own product. If Do-It-Yourself Parts service is available in the
circumstances, the following process will apply.
(A) Do-It-Yourself Parts service where Apple requires
return of the replaced part. Apple may require a credit
card authorization as security for the retail price of
the replacement part and applicable shipping costs.
If you are unable to provide credit card authorization,
Do-It-Yourself Parts service may not be available to
you and Apple will offer alternative arrangements for
service. Apple will ship a replacement part to you with
installation instructions and any requirements for the
return of the replaced part. If you follow the instructions,